Which statement best explains what causes the phase change from solid ice to liquid water?

The melting point is the temperature at which a solid changes into a liquid. The melting point of a solid is the same as the freezing point of the liquid. At that temperature, the solid and liquid states of the substance are in equilibrium. For water, this equilibrium occurs at 0°C.

Explanation:

 Heat or pressure causes the phase change from solid ice to liquid water.